BD81A76EFV-M - Automotive-Grade Backlight LED Driver Optimized for LCD Panels

18 September 2019 - 0 Comments

ROHM announced the availability of the latest LED driver IC, the BD81A76EFV-M, optimized for LCD backlight in instrument cluster, center information displays and car navigation. Unlike conventional drivers with 4 channels that support LCDs up to 8”, this IC provides 6 channels of output (with 120mA per channel) that can support LCD panels of up to 10-12” class. At the same time original buck-boost control ensures compatibility with both small and large LCDs using a single driver. This makes it possible to develop a common design of LCD control board suitable for conventional panels along with the latest large-size displays.

Key Features

1. Original buck-boost control supports a common control board design

The BD81A76EFV-M incorporates proprietary buck-boost control to provide greater application flexibility in LCD applications. In contrast to conventional 6channels backlight LED drivers utilizing only boost control. Although conventional LED drivers are only capable of driving 36 to 60 LEDs (6-10 LEDs/channel), ROHM’s new driver IC expands the range from 6 to 60 LEDs (1-10 LEDs/channel). This ensures the support of not only larger displays but also small and medium size panels as well using a single driver, contributing to a common design of control board.

2. Class-leading 6ch output enables compatibility with the latest 12” displays

Incorporating a constant current driver with low heat generation enables a best-in-class 6 channels LED current output of 120mA per channel. Unlike conventional 4 channels products that support LCDs up to 8”, ROHM’s new driver can accommodate larger panels in the 10-12” class. In addition, original PWM dimming technology (patent no. 2018-169705) provides a dimming ratio of 10,000:1, improving visibility and greater design flexibility for center information displays and instrument clusters.

3. Low standby current minimizes power consumption

Leveraging analog design expertise and process technologies allowed ROHM to reduce standby current consumption to just 10µA. This reduces power consumption to less than 1/3 compared with functionally equivalent products featuring a standby current of 40µA (typ.).

4. Spread spectrum function ensures high reliability, low noise operation

In addition to obtaining qualification under the international AEC-Q100 standard for automotive reliability, the BD81A76EFV-M integrates a spread spectrum function as a countermeasure against EMI that allows it to clear CISPR25 noise requirements for vehicle applications. The result is stable operation in automotive systems sensitive to noise.